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Crystals with green luster, reddish-brown powder after grinding. Soluble in alcohol and dilute sodium hydroxide solution, slightly soluble in water. Acid-base prompter. Make 0.1% solution or 0.04% aqueous solution with 20% ethanol (dissolve 0.04g of this product in 1.05ml of 0.1M NaOH solution), and then dilute to 100ml. pH color change range: 7.2 (yellow)-8.8 (purple); 2.0 (red)-3.0 (amber). Production method: Mix benzene methanesulfonic anhydride, o-cresol, and anhydrous zinc chloride, stir and heat, and condense at 115-120 ° C for about 7 hours, and pass water vapor to remove the remaining o-cresol. Filter, dissolve the filter cake with hot sodium carbonate aqueous solution, filter, add 1:1 hydrochloric acid to the clear filtrate to neutralize, and stir vigorously. The crystals are filtered out, washed with a small amount of water, and dried to obtain the finished product. If necessary, it can be purified by recrystallization with glacial acetic acid.
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